Gravimetric Feeder

Gravimetric Dosing Systems: What are they, how do they work, and what are their advantages?
The operating principle of a gravimetric single-screw feeder is as follows: the entire feeding system is located on a weighing platform. As the screw feeder operates, the system is continuously weighed at each time unit, and the decreasing amount of material is calculated. This material amount is compared to the target value, and a command is given to the motor for the calculated appropriate speed. With simultaneous control and correction, the target value is kept within a precise tolerance band.

Advantages:
Gravimetric feeders encompass several significant features compared to traditional volumetric feeding systems. This feeder is more precise, allowing for savings on raw materials used in the system and achieving homogeneity in the system output, leading to more efficient plant operation. A gravimetric dosing system working with an accuracy of 0.2% instead of a feeder operating with 10% accuracy in a volumetric system will result in a 9.8% saving for your business every hour. Through its specialized software, the system continuously monitors the output, preventing deviations from the target value and detecting changes in flow characteristics that may occur over time. This ensures not only accuracy but also linearity in the system. Additionally, controlled operation during and after the refill contributes to the linearity of the flow. Other advantages of the gravimetric system include:
- Simultaneous weight measurement and control of the feeding amount with a closed-loop control system.
- Control of up to 8 feeders simultaneously.
- Automatic adaptation to changes in material density that may occur over time within broad limit ranges.
- Direct control of material and output quantity.
- High linearity.
- Immediate detection of interruptions in material feeding.
- High accuracy, linearity, and consistency.

Applications:
Gravimetric loss-in-weight feeders find a wide range of applications in sectors commonly utilizing dosing applications. These sectors include:
- Plastic Industry (Extruders, Injection Systems, etc.) - Food Industry
- Mining and Chemical Industry
- Pharmaceutical Industry


Gravimetric single-screw feeders are used in continuous dosing applications for the following types of materials:
- Particle Materials
- Powder Materials
- Granular Materials
- Fibrous Materials
- Flake Materials

Design:
Flexible design solutions are offered for different materials and capacities. Application-specific solutions can be found for particle, fiber, or powder materials. The feeding capacity can range from 1 to 3000 L/h. Its single-motor design provides an elegant appearance, and its gear system-operated horizontal mixing structure ensures linear flow for low-flow coefficient powder materials, minimizing feeder error rates.
The PULSCELL weighing unit, with a resolution of 1:1,000,000, ensures the accuracy and linearity of the feeder system at a precise level of 0.2%. The control system features a user-friendly interface, making it easier for operators by providing all the necessary information on the touch screen panel.

Optional Choices:
- Asymmetric or Symmetric Bunker - Special vibrator addition for powder and fibrous materials
- Various screw diameter options
- Vertical outlet tube
- Outlet pipe options
- Flexi connection accessories